Bruce Springsteen is the latest voice in a chorus of mourners sharing their grief after Tom Petty passed away of cardiac arrest at the age of 66 on Monday (Oct. 2). Springsteen expressed his grief in a series of three tweets late Tuesday morning.

"Down here on E Street, we're devastated and heartbroken over the death of Tom Petty," he wrote. "Our hearts go out to his family and bandmates. I've always felt a deep kinship with his music. A great songwriter and performer, whenever we saw each other it was like running into a long lost brother. Our world will be a sadder place without him."

In Petty's 2015 biography by Warren Zanes, simply titled Petty, a brief interaction between Petty and Springsteen is detailed, demonstrating the kinship between the rockers that The Boss references in his tweets:

Around the time he drove the car off the lot, he got a call from Bruce Springsteen. Petty had seen Springsteen at the Roxy, in the months before Born to Run was released, and liked what he saw, recognized a fellow traveler. Petty didn’t know the man, but Springsteen wasn’t shy in the way Petty was. The guy from New Jersey put in the call, just to hang out, one rock and roller to another…

Petty picked him up at the Sunset Marquis. They went down Sunset Boulevard to the water, stopping at Tower Records on the way, picking up half a dozen eight-tracks. They drove until they’d listened to every song on every one of them. The Stones’ 12 x 5 was among the tapes. When “Congratulations” came on, Springsteen raised his arms to the heavens and said, “You can take me now!” Petty loved that. He liked knowing another man out there who went to the same church.

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Tom Petty In Memoriam | Billboard